TMS570 Timed CAN transmission

JHough

I have a system that requires the transmission of CAN messages at a fixed interval of 10ms. It doesnt really fit to does this by any other method than interrupt driven or the timings of this or other tasks will suffer.

What is the best way to do this? I was hoping there would be a way to tie the mailbox to a rti event but i dont see anything in the TRM about this,

I could see DMA being a possibility but most of the time the data in the mailboxes will be static so this seems a heavy handed way to simply request a TX of a mailbox.

Has anyone done anything like this? I need to consume as little CPU time as possible for this task.

Thanks

over 12 years ago

0 Zhaohong Zhang over 12 years ago

TI__Mastermind 22715 points

James,

I would suggest the following.

(1) Set up a RTI compare interrupt every 10 ms.

(2) In the RTI ISR, write the new message to the transmit mailbox and transmission will start when bus is available. You may want to select mailbox 0 (which has the highest priority) for doing this.

Please let me if the above solves your problem.

Thanks and regards,

Zhaohong

0 Zhaohong Zhang over 12 years ago in reply to Zhaohong Zhang

TI__Mastermind 22715 points

James,

Do you need more information on this topic? Would you please select the "verified" button if you consider that this question is answered?

Thanks and regards,

Zhaohong

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TMS570 Timed CAN transmission